hey, i got a mega-problem here. i just got a new 300 watt Legacy amp today (for free). so i decided to wire it in with my 250 Watt Road Gear amp, for my 2 400w (a piece) MTX subs. the only problem is, when i hook them each up seperately, either works.... but when you hook them up together, neither does. what's going wrong here? is it that even though the subs are 400 watts a piece, when they're wired in series (two subs, one wire hookup) they can only handle 400 watts? or...?